Manufacture of braided cords or cables for electric lighting or like purposes.



No. 703,837. Patented July 1, I902. 13. SOHURMANN. MANUFACTURE OFBRAIDED CORDS 0R CABLES FOR ELECTRIC LIGHTING 0R LIKE PURPOSES.

(Application filed Dec. 24, 1900.)

(In model. i

is ca, PHOTO-LITHQ. WASHINGTON o c UNITED STATES PATENT OFFICE.

CARL SCIIIIRMANN, OF DUSSELDORF, GERMANY.

MANUFACTURE OF BRAIDED CORDS OR CABLES FOR ELECTRIC LIGHTING 0R LIKEPURPOSES.

SPECIFICATION forming "part Of Letters Patent N0. 703,837, dated July 1,1902.

Application filed December 24, 1900. Serial No. 40,946. (No model.)

To all whom, it may concern:

Be it known that I, CARL SGH'URMANN, a subject of the Emperor ofGermany, residing at Dusseldorf, Germany, have invented certain new anduseful Improvements in the Manufacture of Braided Cords or. Cables forElectric Lighting and Like Purposes,of which the following is aspecification.

In the drawings, Figures 1 and 1 are crosssectional views showing themanner of braiding the conductors with and without the central core.Fig. 1 shows in cross-section a common manner of placing the cords onthe conductor. Figs. 2 and 3 are views corre sponding to Fig. 1, showingdifferent ways of applying three cords to as many conductors. Fig. 3 isa similar view, on a reduced scale, corresponding to Fig. 1, but showingthe three-cord procedure; and Fig. 3 shows in cross-section a well-knownmanner of placing the cords on the conductors. Fig. 4 shows in sideelevation a cord of the kind represented in Fig. 1.

Like characters refer to like parts in all the figures of the drawings.

This invention relates to the manufacture of braided cords or cables forelectric lighting and like purposes; and it consists, essentially, inthat the several wires orconductors required for the manufacture of thecords,&c., are united or connected together by the braid in the processof braiding the separate wires and can, if desired, be also laid ortwisted together for the purpose of increasing the speed of braiding byreducing the number of steps heretofore employed in the manufacturethereof and of diminishing the risk of shortcircuiting.

My invention is illustrated in the accompanying drawings, in which thebraided and connected wires or conductors are shown in cross-section.

Figs. 1 and 1 show the new method applied to the braiding ofelectric-light cords with two conductors, with and without a carrier orinsulation core, respectively. The copper Wires or conductors A and B,which are first covered with india-rubber strip and cotton, are thenbraided simultaneously by two systems of threads d and e, which maydiffer externally in color in such a manner thatthe color system (Z onlymoves around the wire A and the insulation or carrier core T, while thecolor system c only moves around the wire B and around the carrier-coreT, in which operation the systems d and 6 cross each other and are thusconnected together. \Vhen unnecessary, the insulation -core T, whichruns straight along the axis, can 0bviously be dispensed with, Fig. 1.

Fig. 1 shows in side elevation an example of the cord shown in Fig. 1.In this cord the light braiding-threads d (Z passing spirally around thecore A, interloop with those 6 c, passing spirally around the core B,this inter-looping being-indicated by dotted lines. The cores A B are,moreover, laid or twisted around each other in a similar manner to theflexible electric-light cords heretofore employed.

W'ith cords having three conductors two methods of interweavin Fi s. 2and 3, are

possible according to my invention. In Fig. 2 each wire or conductor isonly covered by one system of threads. Thus A by (I only, B by 6 only, Gbyf only. These three systems of threads, however, cross and interlockwith each other in the center. In Fig. 3, on the other hand, each singlewire or conductor is braided by two systems of threads, which also crosseach other and interlock. Thus A is braided by d and f, B by c and (l, Oby e and f. In three-conductor cables of this kind the insulation orcarrier core T can also be dispensed with, if desired, Fig. 3.

In the methods heretofore employed for the manufacture of electric-lightcords, &c., each single core is braided all around by itself, and thebraided cores are afterward laid or twisted together to unite them,Fig. 1. A cable of this kind has thus no special insulating orcarrier-core, and consequently does not nearly present the securityagainst short-circuiting possessed by a cable made as shown in Fig. 1.If a carrier-core be employed, (for supporting the incandescent lamp,&c.,) one is compelled with the methods heretofore employed to braidthis insulating carrier-core by itself and then to lay or twist ittogether with the two other copper wires or cores, Fig. 8 Obviously thecarrier-core has to follow the spiral rotation of the copper cores orwires, and it cannot therefore be determined what load is effectivelytaken by the carriercore. Moreover, by using a carrier-core ac- I core,and simultaneously interlooping the cording to the methods heretoforeemployed the risk of short-circuiting is not reduced, since the smalldistance apart of the inner copper Wires from each other remains thesame. According to my new method, Fig. 1, this distance is equal to thediameter of the insulation-core plus double the thickness of thebraiding and of the internal covering.

What I claim is- 1. A method of covering a plurality of conductors and acentral core for electric-light cords, consisting in braiding a systemof covering-threads around each conductor and the central core, andsimultaneously interloopin g the threads of the several systems,substantially as described.

2. A method of covering a plurality of conductors and a central core forelectric-light cords, consisting in arranging the conductors in groups,braiding a system of coveringthreads around each group and the centralthreads of the several systems, substantially as described.

3. A plurality of conductors, a core, systems of threads, each systembraided around a conductor and the core and inter-looped with the othersystems between said conductors, substantially as described.

4. A plurality of conductors arranged in groups, a core, and systems ofthreads, each system braided around a conductor and the core andinterlooped with the other systems between said conductors,substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

CARL SCI-IURMANN.

Witnesses WILLIAM ESSENWEIN, ERNs'r LAMBERTS.

